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Read a real Marstek CT002/CT003 as a power source - #737
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Decompiled the archived CT002 (HME-4 v120, v124) and CT003 (HME-3 v116, v117, v118, v122) images and wrote down what the protocol doc was missing or had wrong: - The CT replies to the request's source IP and port (stored per slot), never broadcasts, and runs UDP on its Quectel Wi-Fi module. - What it accepts: checksum, fields 1-6, wildcard or own CT MAC, and a CT type matching its own (prefix compare). Battery type and MAC are not validated and no app pairing is needed. Only CT002 v124 / CT003 v122 read the participate field; older images ignore a 7th field. - Slots: 15 on CT002 v120+, 9 on CT003 (the doc said 9 for both). - Eviction: slots age in 30 s steps and clear at age 2, so a silent battery is dropped 30-60 s after its last request. The doc said "~1-2 cycles", which issue #462 read as poll cycles. - Cadence: one reply per request, slots served in turn; v124/v122 pause 500 ms after each reply (about two replies per second in total). - A 30-minute no-valid-request watchdog reboots the CT. The adaptive consumer TTL (#462) was described as matching the real CT in comments, config examples, the generator's help text and the docs. It is much stricter than the CT, so those now say so and point at 60 s for a CT-like fixed window. Wording only; no behavior change. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
Folds in the findings from #544: the newer CT002 hardware (TPM2-100CT) announces itself as TPM2-0, ignores requests naming another type, sends the 28-field reply, and counts its energy fields in 0.1 Wh. Adds what the firmware archives say about it: - The Venus E 3.0 (VNSE3-0 v150) maps its meter-type setting to the CT type it sends (3 HME-4, 4 HME-3, 8-10 SMR-0/1/2, 11 TPM2-0) and talks UDP to port 12345 for all six. - The CT003 (HME-3 v122) P1 parser stores kWh x 10000 + fraction x 10, i.e. 0.1 Wh per count, matching the TPM2-0 measurement. This settles the scale the doc listed as unknown. No TPM2-0 firmware is public, so the slot, cadence and field-width sections now say they are verified for HME-4/HME-3 only. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-authored-by: Medo42 <[email protected]> Co-Authored-By: Claude Opus 5.5 <[email protected]>
Adds [MARSTEK_METER], which polls a real Marstek CT over its UDP protocol the way a battery does and takes the measured phase powers from the reply, so users who own a CT can let AstraMeter steer the batteries instead. The request is a battery with phase 0, power 0 and participate 0: the CT counts it in no bucket, so batteries still on the CT see no extra reporter (CT firmware for HME-4/HME-3; PR #544 captures for TPM2-0). The CT type is detected by trying HME-4, TPM2-0 and HME-3 in turn, since a CT silently ignores a request naming another type; the CT's MAC is learned from its first reply. Both can be set as MAC / TYPE. AstraMeter must never read its own emulator, so: - the reader uses a connected socket to IP:12345 (only the CT's replies arrive, broadcast is refused) and refuses an IP that is this machine; - it refuses replies naming the wildcard MAC (an emulator without CT_MAC echoes it), an AstraMeter-registered 02b250 MAC, or a configured [CT002]/[CT003] CT_MAC, and rejects a MAC equal to one at startup; - it announces a battery MAC under the new READER_MAC_PREFIX (02a57e), and the emulator drops requests carrying it, on both stacks. A reading older than 10 s counts as an outage rather than a frozen value, and a warning names batteries still paired with the real CT. Tests: reader unit tests including a real-socket fake CT that answers only its own type, a factory test, a shared e2e scenario proving both emulators ignore the reader, and a host gtest for is_reader_mac. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
With WAIT_FOR_NEXT_MESSAGE on (the default) a battery's poll waited for the background timer's next reply: up to POLL_INTERVAL, about 0.5 s on average, on top of the CT's own reply delay. wait_for_next_message now sends a request straight away, unless one went out within the last 0.5 s (the pause a current CT takes after each reply), so the wait is just the CT's reply time. The timer stays: it keeps load on the CT fixed however many batteries and emulators read, keeps the reading and its online status live while no battery polls, detects the CT type without blocking reads, and keeps the CT from its 30-minute no-request reboot. A request while ours is still unanswered costs the CT nothing, since a slot gets one reply however often it asks. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughAdds a UDP-backed Marstek CT002/CT003 power-meter source with CT type discovery, reply validation, freshness checks, and configuration support. The CT002 emulator ignores requests from AstraMeter’s reader. Documentation describes meter setup and CT protocol details. ChangesMarstek meter support
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant Caller
participant MarstekMeter
participant MarstekCT
MarstekMeter->>MarstekCT: Send UDP meter request
MarstekCT->>MarstekMeter: Return CT reply
Caller->>MarstekMeter: Request phase readings
MarstekMeter-->>Caller: Return fresh phase readings
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 16.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 71 functions across 18 files. (2 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly and concisely identifies the primary change: adding support for reading a real Marstek CT002/CT003 as a power source. Description check The description includes the required Why and Checklist sections, explains the implementation and verification, records known limitations, and marks the checklist items complete.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 16.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 71 functions across 18 files. (2 skipped: 2 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Resolves the CHANGELOG.md conflict by keeping all three ## Next bullets. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
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test_detects_the_ct_over_a_real_socket timed out in validate (3.11): the fake CT asserted isinstance(transport, asyncio.DatagramTransport) in connection_made, but before Python 3.12 the selector loop's UDP transport is not a DatagramTransport subclass, so the assert raised inside the callback, the transport was never stored and the CT never replied. Cast instead; the reader itself is unaffected. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
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marked this pull request as ready for review
October 18, 2026 18:04
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Inline comments:
Review comments at @docs/ct002-capture-analysis.md:
- Around line 175-177: Update the earlier energy-field summary near `F25`–`F28`
to list both CT003 (`HME-3`) and newer CT002 (`TPM2-0`) as carrying the four
trailing registers, while keeping original CT002 (`HME-4`) excluded.
Review comments at @docs/powermeters.md:
- Around line 494-499: Update the AstraMeter polling description so it
distinguishes unchanged phase totals from CT slot usage. State that each
accepted poll occupies or refreshes a finite CT slot and that a full CT002 or
CT003 table may prevent a newly directly paired battery from obtaining a slot.
Review comments at @src/astrameter/powermeter/marstek_meter.py:
- Line 267: In the phase-reading update path, validate all three fields selected
by _PHASE_FIELDS before changing self.values or _last_reply_monotonic. Reject
the reply if any phase field is blank or non-integer, rather than allowing
parse_int to turn it into a fresh zero reading.
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📒 Files selected for processing: 27
CHANGELOG.mdREADME.mdconfig.ini.exampledocs/ct002-capture-analysis.mddocs/ct002-ct003-protocol.mddocs/ct002.mddocs/esphome-powermeters.mddocs/powermeters.mdesphome.example.yamlesphome/components/ct002/__init__.pyesphome/components/ct002/ct002.cppesphome/components/ct002/ct002.hesphome/components/ct002/protocol.cppesphome/components/ct002/protocol.hsrc/astrameter/config/config_loader.pysrc/astrameter/config/config_loader_test.pysrc/astrameter/config/settings.pysrc/astrameter/ct002/ct002.pysrc/astrameter/ct002/protocol.pysrc/astrameter/powermeter/__init__.pysrc/astrameter/powermeter/marstek_meter.pysrc/astrameter/powermeter/marstek_meter_test.pysrc/astrameter/web_config.pytests/components/ct002/host_protocol_test.cpptests/components/ct002/test_shared_e2e.pytests/test_ct002_protocol.pyweb/ts/schema.ts
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parse_int read a blank or garbled phase field as 0, which the reader then published as a fresh reading the batteries would steer on. Parse the three phase powers strictly and drop the reply, before it updates any state, when one isn't an integer. Also from review: the setup guide now says the reader takes one of the CT's battery slots, and the capture analysis lists TPM2-0 alongside the CT003 as carrying the energy registers. Claude-Session: https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Why
Some users already own a Marstek CT002 or CT003 and want AstraMeter to steer their batteries instead of the CT. Until now they had to add a second meter or bridge the CT through Home Assistant. With the new
[MARSTEK_METER]source, AstraMeter reads the CT directly, over the same UDP protocol the batteries use. The batteries are then paired with AstraMeter's emulated CT.What's in it
1. The protocol doc, checked against decompiled CT firmware. No real CT was available, so the CT side was worked out from the archived firmware images: CT002
HME-4v120/v124 and CT003HME-3v116/v117/v118/v122.docs/ct002-ct003-protocol.mdgains:2. The adaptive consumer timeout was described wrongly. It was described as "like the real CT" in code comments on both stacks, the config examples, the generator help text and the docs. It is much stricter than the real CT. That premise came from #462, which read "cycles" as polls. Only the wording changed; the behavior is the same.
3. The newer CT002 (
TPM2-0) and the energy-field scale.HME-4, 4 →HME-3, 11 →TPM2-0, and 8–10 →SMR-0/1/2.4. The
[MARSTEK_METER]source (powermeter/marstek_meter.py).0, power0andparticipate = 0. The CT counts it on no phase, so the totals other batteries see don't change. It does take one of the CT's battery slots.5. AstraMeter never reads itself.
02b250…MAC, or the[CT002]/[CT003]CT_MAC.02a57e. Both emulators, Python and ESP32, now ignore that MAC. This is the only change on the ESP32 side.Verification
a91eb48: all 78 checks, includingvalidateon 3.10–3.13,ct002-host-protocol,ct002-host-e2eand every ESPHome compile.isinstancecheck those versions fail. Fixed in656d0e9.a91eb48, and its re-review found nothing new.uv run ruff format . && uv run ruff check . && uv run mypy src/: clean.uv run pytest: 2020 passed after mergingdevelop.is_reader_mac.Open questions
TPM2-0firmware isn't public: its slot count, pacing and field widths are unverified.ct_macgap: act_macset through the add-on options, rather than in[CT002], isn't in the reader's own-MAC check. Self-reads are still prevented because the emulator ignores the reader's MAC.Checklist
develop, notmainuv run ruff format . && uv run ruff check . && uv run mypy src/ && uv run pytestweb/changes: rebuilt the dashboard bundle (cd web && npm run build:dashboard) and committed it (onlyschema.tschanged;check:dashboardreports it up to date)## Nextin CHANGELOG.md🤖 Generated with Claude Code
https://claude.ai/code/session_01QxJguWeekr7jgoQjZPEAvo
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